Question
This property of a polycrystalline material is increased by applying strain at cold temperatures to introduce defects; analogously, it decreases when steel is tempered. For 10 points each:
[10e] Name this property which is nebulously quantified using the Mohs scale.
ANSWER: hardness [reject synonyms]
[10m] Cold annealing increases hardness but decreases this measurement of a metal’s plasticity. Materials that have this property are not brittle and can be easily drawn out in one dimension by rearranging their defects.
ANSWER: ductility [or ductile; reject “malleable” or “malleability”]
[10h] Work hardening creates defects at the boundary between these regions of a polycrystalline material. The size of these internally ordered regions determines the strength of an alloy.
ANSWER: grains [or grain size; or grain boundaries]
<Adam Silverman, Science - Chemistry> ~20850~ <Editor: Adam Silverman>
Summary
| 2023 PACE NSC | 06/10/2023 | Y | 1 | 10.00 | 100% | 0% | 0% |
Data
| Barrington A | Thomas Jefferson A | 10 | 0 | 0 | 10 |